CN110981358A - High-flow-viscosity high-adhesion compensation shrinkage UHPC and preparation method thereof - Google Patents

Abstract

The application discloses UHPC (ultra high performance concrete) with high fluidity and high bonding compensation shrinkage and a preparation method thereof, wherein the UHPC with high fluidity and high bonding compensation shrinkage consists of portland cement, quartz powder, fly ash microbeads, silica fume, magnesium oxide, quartz sand, steel fibers, a water reducing agent, a defoaming agent, polymer emulsion and water, the shrinkage of the UHPC at the early stage, the middle stage and the later stage can be effectively inhibited by adding the magnesium oxide into the UHPC, the synchronous compensation shrinkage performance matched with slurry can be realized along with the extension of the age of the UHPC, the volume of the UHPC is further effectively controlled, good volume stability is maintained, shrinkage cracks are reduced, the bonding force with external structures such as steel plates, sleeves and old concrete is improved, and the problems of cracking, slippage, empty drum and the like of a concrete structure are further prevented.

Description

High-flow-viscosity high-adhesion compensation shrinkage UHPC and preparation method thereof

Technical Field

The application relates to the technical field of building materials, in particular to a high-fluidity high-viscosity compensation shrinkage UHPC and a preparation method thereof.

Background

Ultra-High Performance Concrete (UHPC) is also called Reactive Powder Concrete (RPC), and realizes the large span of engineering material Performance by the Ultra-High durability and Ultra-High mechanical property. The ultra-high-performance polycarbonate (UHPC) is mainly used in the fields of steel-concrete composite beam bridge decks, super high-rise buildings, concrete structure reconstruction, thin layer reinforcement and the like, the performance of the existing commonly-used UHPC is greatly improved, but the adhesion between the UHPC and steel bars, old concrete or asphalt layers and the like is poor, so that the problems of cracking, slipping or hollowing and the like are caused, the fatigue resistance, the adhesion, the breaking strength and the safety stability of the structure are directly influenced, and the application range of the high-performance material is greatly limited.

Disclosure of Invention

In view of the above-mentioned shortcoming that present UHPC exists, the application provides a UHPC that contracts is compensated to high viscosity high bonding that flows, can improve UHPC's cohesiveness greatly, and then prevents that concrete structure from appearing problem such as fracture, slip or hollowing.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

a high-flow-viscosity high-bonding compensation shrinkage UHPC comprises the following components in parts by weight:

100 parts of Portland cement;

10-20 parts of quartz powder;

10-20 parts of fly ash microbeads;

15-30 parts of silica fume;

5-10 parts of magnesium oxide;

120-150 parts of quartz sand;

20-40 parts of steel fibers;

2-4 parts of a water reducing agent;

0.3-0.5 part of defoaming agent;

5-10 parts of a polymer emulsion;

20-30 parts of water.

Because UHPC is used in a large amount in the construction process and is often shrunk in the construction of reinforcement engineering, research shows that the self-shrinkage and the drying shrinkage of the UHPC can reach 800 multiplied by 10 respectively^-6、1000×10^-6In the above, by adding magnesium oxide into UHPC, the shrinkage of UHPC in early, middle and later stages can be effectively inhibited, the synchronous compensation shrinkage performance matched with slurry can be realized along with the extension of the age of UHPC, the volume of UHPC is further effectively controlled, good volume stability is maintained, shrinkage cracks are reduced, the bonding force with external structures such as steel plates, sleeves and old concrete is improved, and the problems of cracking, slipping or hollowing of a concrete structure are further prevented; in addition, by adding the polymer emulsion into UHPC, along with the hydration of the Portland cement, the polymer gradually forms a three-dimensional film network after the water in the emulsion is lost, and the polymer and the cement paste form a whole, so that the micro cracks in a particle transition area can be effectively reduced, and the structure is more compact. Meanwhile, the polymer emulsion can also retain part of free water in the UHPC, so that the internal curing effect is realized, further hydration of silicate is facilitated, and drying shrinkage of the UHPC caused by water evaporation is reduced. The magnesium oxide and the polymer emulsion are used simultaneously, so that the caking property, the toughness and the durability of the UHPC are obviously improved.

Preferably, the portland cement is portland cement having a strength grade of 42.5 or more. The selected Portland cement with the strength grade of 42.5 or above can effectively ensure the excellent performance of the UHPC.

Preferably, the Portland cement has a Boehringer's specific surface area of not less than 1000m²Kg, mean particle diameter Dav not greater than 6 μm, median particle diameter D50 not greater than 7 μm. By using the cementing material with reasonable grain diameter, the stacking state of the UHPC can be more compact and stable, and the water consumption can be reduced while the fluidity is kept high.

Preferably, the fineness of the quartz powder is 800 meshes and SiO₂The content is not less than 99 wt%. The quartz powder is doped into the portland cement to form a cementing material together with the portland cement, the 800-mesh particle size is 15 mu m, and the portland cement can be embedded into gaps of the quartz powder by reasonably matching the particle size of the cementing material, so that the packing state is tighter and the fluidity is better.

Preferably, the content of the spherical micro-beads of the fly ash micro-beads is not less than 90%, the fineness is not less than 1200 meshes, and the ignition loss is less than 2%. Because the micro-bead particles are extremely fine, gaps among cement particles can be filled when the micro-bead particles are added into the portland cement, free water can be discharged, the fluidity of cement paste is increased, compact concrete can be formed, and the strength and the durability of the hardened concrete are greatly improved compared with those of common concrete.

Preferably, the silica fume has a Boehringer's specific surface area of not less than 20000m²/kg，SiO₂The content is not less than 95 wt%, and the silica fume is superfine high-purity silica fume. In the forming process, the silica fume is acted by surface tension in the phase change process to form amorphous phase amorphous spherical particles, the surface of the amorphous phase amorphous spherical particles is smooth, and some amorphous spherical particles are aggregates formed by sticking a plurality of spherical particles together. It is a volcanic ash substance with large specific surface area and high activity. The small spheroids of the portland cement doped with silica fume can play a role in lubrication, so that the fluidity of cement slurry is increased.

The Portland cement, the quartz powder, the fly ash microbeads and the silica fume have different particle sizes, and the components with smaller particle sizes can be embedded into gaps with larger particles by reasonably setting the proportion of the components, so that a more compact stacking state is formed, and the strength and the fluidity of the UHPC are effectively ensured.

Preferably, the Boehringer specific surface area of the magnesium oxide is 300-350 m²(iii)/kg, the purity of the magnesium oxide is not less than 95 wt%. In order to ensure that the magnesium oxide has good water absorption expansion work, the Boehringer specific surface area of the magnesium oxide is preferably 300-350 m²The purity is preferably not less than 95 wt./kg.

Preferably, the magnesium oxide comprises dead-burned magnesium oxide and light-burned magnesium oxide, and the weight ratio of the dead-burned magnesium oxide to the light-burned magnesium oxide is 3: 7. the magnesium oxide expanding agent is mainly hydrated to generate magnesium hydroxide to expand, and the calcination temperature or the heat preservation time is changed, so that the compactness of the crystal structure is changed. The crystal of the dead burned magnesium oxide is relatively slow in generation, the expansion stress relaxation phenomenon is reduced, and the dead burned magnesium oxide can effectively compensate the drying shrinkage of the concrete in the middle and later periods when being doped into UHPC. The light-burned magnesium oxide has a relatively loose crystal structure and a plurality of lattice defects, so that the hydration rate is high, and the early shrinkage of UHPC can be effectively compensated. Due to the characteristics of large using amount, low water-to-gel ratio and no coarse aggregate of the UHPC cementing material, the shrinkage rate of the UHPC cementing material is larger. At the same time, the volume shrinkage develops rapidly, and the self-shrinkage occurs mainly before the age of 7d, so that the incorporation of components for compensating the early shrinkage is particularly important. The preparation method of the composite magnesium oxide comprises the following steps: calcining magnesite at 1200-1350 ℃ for 2 hours to obtain dead-burned magnesia, calcining the magnesite at 800-1000 ℃ for 1 hour to obtain light-burned magnesia, and then calcining the dead-burned magnesia and the light-burned magnesia according to the mass ratio of 3: 7 to obtain the magnesium oxide adopted by the application.

Preferably, the fineness of the quartz sand is 40-100 meshes and SiO is₂The content is not less than 97 wt%, and the bulk density is not less than 1900kg/m³. As a mineral admixture, the quartz sand can form a low water-cement ratio and a high cement ratio, improves the hydration degree of portland cement, increases the compactness of concrete, further improves the strength of the concrete, and in addition, the concrete has acid and alkali resistance and certain corrosion resistance by utilizing the strong acid-resistant medium corrosion resistance.

Preferably, the length of the steel fiber is 13 plus or minus 10 percent mm, the diameter is 0.22 plus or minus 10 percent mm, the length-diameter ratio is 60, the tensile strength is not less than 2850MPa, and the number of the fiber is not less than 22 ten thousand per kg.

Preferably, the steel fiber is an end hook type fine steel fiber. The end hooks at the two ends of the steel fiber can increase the anchoring force and the adhesive force between the steel fiber and a cement matrix, improve the tensile property, the compression resistance and other properties of the UHPC, and the shape qualification rate is not less than 98 percent.

Preferably, the surface of the steel fiber is plated with a rust-proof layer.

Preferably, the rust-preventive layer is a copper layer. The antirust layer made of the antirust material can effectively prevent the steel fiber from being corroded by rust and increase the durability of the UHPC.

Preferably, the water reducing agent is a polycarboxylic acid type powder water reducing agent, the water reducing rate of the polycarboxylic acid type powder water reducing agent is not less than 35%, and the gas content is not more than 5.0%

Preferably, the defoaming agent is a polyether defoaming agent, the content of the effective substances of the polyether defoaming agent is not less than 99%, and the retention amount of a 22-mesh screen is not more than 5%.

Preferably, the polymer emulsion is a polyacrylate emulsion, and the solid content of the polymer emulsion is 40-50 wt%.

The preparation method of UHPC comprises the following steps:

uniformly stirring portland cement, quartz powder, fly ash microbeads, silica fume, magnesium oxide, quartz sand, a water reducing agent and a defoaming agent to obtain a first mixture;

sieving steel fibers into the first mixture through a 9.5mm screen mesh, and uniformly stirring to obtain a second mixture;

and uniformly mixing the polymer emulsion with water, and uniformly mixing the polymer emulsion with the second mixture to obtain the UHPC.

The application has the advantages that:

1) this application adopts the magnesium oxide of reasonable ratio, especially will heavily burn the compound magnesium oxide that magnesium oxide and light-burned magnesium oxide mixed and form, can be along with the extension of UHPC age, realize with the synchronous compensation shrinkage performance of slurry assorted, and then effective control UHPC's volume, keep good volume stability, reduce shrinkage crack, improve with the cohesive force of external structures such as steel sheet, sleeve, old concrete, improve the volume stability and the reliability of structure in the UHPC construction is used.

2) The polymer emulsion can effectively improve the bonding strength and toughness of UHPC, promote the hydration of cement, further reduce micro cracks in an interface transition area and improve the durability.

3) The cementing material is formed by multiple components such as portland cement, fly ash microbeads, silica fume and quartz powder, the stacking state is compact by reasonably matching particle sizes, the water consumption can be reduced, the UHPC cohesiveness is improved, the high fluidity is ensured, and the UHPC strength is improved.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The raw material procurement information used in the following examples is as follows:

the preparation method of the composite magnesium oxide comprises the following steps: calcining magnesite at 1200-1350 ℃ for 2 hours to obtain dead-burned magnesia, calcining the magnesite at 800-1000 ℃ for 1 hour to obtain light-burned magnesia, and then calcining the dead-burned magnesia and the light-burned magnesia according to the mass ratio of 3: 7 to obtain the magnesium oxide adopted in the application, wherein the specific calcining temperature of the heavy calcined magnesium oxide and the light calcined magnesium oxide is based on that described in the examples.

The water reducing agent is purchased from Shanghai Sanrui high polymer materials Co., Ltd, and is a VIVID S01 solid polycarboxylic acid superplasticizer;

the defoaming agent is purchased from Guangzhou Moke building materials science and technology limited company, and the model is DF775 type polyether defoaming agent;

the polymer emulsion is obtained from polyacrylate emulsion produced by Shanghai Ke congeal new material science and technology Limited, and the model of the polymer emulsion is sknbs type polyacrylate emulsion.

Other raw materials and specifications are as described in the specific examples.

The performance test method in each of the following examples is as follows:

measurement of mechanical properties: according to the relevant regulations of GB/T31387 reactive powder concrete and GB/T50204 Standard test method for mechanical properties of common concrete.

Determination of flowability: according to the relevant provisions of GB/T standard of common concrete mixture performance test method.

Wrapping degree of the reinforcing steel bars: the test is carried out according to the related regulations DL/T5150 'Water conservancy project concrete test protocol'.

Volume stability, fatigue resistance and durability: reference is made to GB/T50448 technical Specification for cement-based grouting materials and GB/T50082 Standard for testing the long-term performance and durability of ordinary concrete.

The preparation of the high flow and high adhesion compensated shrinkage UHPC in each of the following examples was as follows:

the method comprises the following steps: adding portland cement, quartz powder, fly ash microbeads, silica fume, magnesium oxide, quartz sand, a water reducing agent and a defoaming agent into a stirrer, and uniformly stirring to obtain a first mixture;

step two: screening the steel fibers into the first mixture which is stirred in the stirrer through a 9.5mm sieve, and uniformly stirring to obtain a second mixture;

step three: and (3) uniformly mixing the polymer emulsion with water, adding the mixture into the second mixture in the stirrer, and continuously stirring for not less than 3 minutes to obtain the UHPC with high fluidity and high bonding compensation shrinkage.

Example 1

A high-fluidity high-viscosity bonding compensation shrinkage UHPC comprises the following components in parts by weight: 100 parts of portland cement, 10 parts of quartz powder, 20 parts of fly ash microbeads, 25 parts of silica fume, 10 parts of magnesium oxide, 120 parts of quartz sand, 20 parts of steel fibers, 2 parts of a water reducing agent, 0.5 part of a defoaming agent, 5 parts of a polymer emulsion and 30 parts of water.

Wherein the strength grade of the portland cement is 42.5, and the Boehringer's specific surface area is 1100m²Kg, 5.6 μm for Dav and 6.5 μm for D50; the fineness of the quartz powder is 800 meshes and SiO₂The content is 99.5 wt%; the content of the spherical micro-beads of the fly ash micro-beads is 93 wt%, the fineness is 1250 meshes, and the ignition loss is 1.0%; the Boehringer specific surface area of the silica fume is 22000m²/kg，SiO₂The content was 97 wt%; the magnesium oxide is composite magnesium oxide, wherein the calcination temperature of the heavy calcined magnesium oxide is 1200 ℃, the calcination temperature of the light calcined magnesium oxide is 800 ℃, and the Bosch specific surface area of the composite magnesium oxide is 300m²Per kg, the purity of the magnesium oxide is 97 wt%; the specification of the quartz sand is 40-100 meshes and SiO₂98 wt% content, bulk density 1920kg/m³(ii) a The steel fiber is end hook-shaped copper-plated micro steel fiber meeting the requirements, the length is 13mm +/-10%, the diameter is 0.22mm +/-10%, the length-diameter ratio is 60, the number of the fiber is 25 ten thousand per kg, and the tensile strength is 3000 MPa; the water reducing agent is a polyether type polycarboxylic acid high-performance powder water reducing agent, the water reducing rate is 40%, and the gas content is 4.5%; the defoaming agent is a water-soluble powder defoaming agent industrial product, the content of active substances is 99.2 wt%, and the retention amount of a 22-mesh screen is 2 wt%; the polymer emulsion is polyacrylate emulsion, and the solid content is 50%.

Example 2

A high-fluidity high-viscosity bonding compensation shrinkage UHPC material comprises the following components in parts by weight: 100 parts of portland cement, 20 parts of quartz powder, 10 parts of fly ash microbeads, 30 parts of silica fume, 8 parts of magnesium oxide, 150 parts of quartz sand, 40 parts of steel fibers, 4 parts of a water reducing agent, 0.3 part of a defoaming agent, 10 parts of a polymer emulsion and 25 parts of water.

The strength grade of the portland cement is 52.5, and the Boehringer's specific surface area is 1050m²Kg, 5.7 μm for Dav and 6.6 μm for D50; the fineness of the quartz powder is 800 meshes and SiO₂The content is 99.5 wt%; the content of the spherical micro-beads of the fly ash micro-beads is 95 wt%, the fineness is 1200 meshes, and the ignition loss is 1.0 wt%; the Boehringer specific surface area of the silica fume is 22000m²/kg，SiO₂The content was 97 wt%; the magnesium oxide is composite magnesium oxide, wherein the calcination temperature of the heavy calcined magnesium oxide is 1350 ℃, and the light calcined magnesium oxide is lightThe calcination temperature of the calcined magnesia is 1000 ℃, and the Brinell specific surface area of the conforming magnesia is 350m²Kg, purity of magnesium oxide 97 wt%; the specification of the quartz sand is 40-100 meshes and SiO₂98 wt% content, bulk density 1950kg/m³(ii) a The steel fiber is end hook-shaped copper-plated micro steel fiber meeting the requirements, the length is 13mm +/-10%, the diameter is 0.22mm +/-10%, the length-diameter ratio is 60, the number of the fiber is 25 ten thousand per kg, and the tensile strength is 3000 MPa; the water reducing agent is a polyether type polycarboxylic acid high-performance powder water reducing agent, the water reducing rate is 40%, and the gas content is 4.5%; the defoaming agent is a water-soluble powder defoaming agent industrial product, the content of active substances is 99.2 wt%, and the retention amount of a 22-mesh screen is 2 wt%; the polymer emulsion is polyacrylate emulsion with solid content of 40%.

Example 3

A high-fluidity high-viscosity bonding compensation shrinkage UHPC material comprises the following components in parts by weight: 100 parts of portland cement, 15 parts of quartz powder, 15 parts of fly ash microbeads, 15 parts of silica fume, 5 parts of magnesium oxide, 140 parts of quartz sand, 30 parts of steel fibers, 3 parts of a water reducing agent, 0.4 part of a defoaming agent, 8 parts of a polymer emulsion and 20 parts of water.

The strength grade of the portland cement is 52.5, and the Boehringer's specific surface area is 1000m²Kg, 5.7 μm for Dav and 6.6 μm for D50; the fineness of the quartz powder is 800 meshes and SiO₂The content is 99.5 wt%; the content of the spherical micro-beads of the fly ash micro-beads is 95 wt%, the fineness is 1200 meshes, and the ignition loss is 1.0%; the Boehringer specific surface area of the silica fume is 22000m²/kg，SiO₂The content was 97 wt%; the magnesium oxide is composite magnesium oxide, wherein the calcination temperature of the heavy calcined magnesium oxide is 1350 ℃, the calcination temperature of the light calcined magnesium oxide is 1000 ℃, and the composite Bosch specific surface area is 350m²Per kg, the purity of the magnesium oxide is 97 wt%; the specification of the quartz sand is 40-100 meshes and SiO₂98 wt% content, bulk density 1950kg/m³(ii) a The steel fiber is end hook-shaped copper-plated micro steel fiber meeting the requirements, the length is 13mm +/-10%, the diameter is 0.22mm +/-10%, the length-diameter ratio is 60, the number of the fiber is 25 ten thousand per kg, and the tensile strength is 3000 MPa; the water reducing agent is a polyether type polycarboxylic acid high-performance powder water reducing agent, the water reducing rate is 40%, and the gas content is 4.5%; the defoaming agent is a water-soluble powder defoaming agent industrial productThe content of effective substances is 99.2 wt%, and the retention capacity of a 22-mesh screen is 2 wt%; the polymer emulsion is polyacrylate emulsion with solid content of 45%.

The weight ratio of the raw materials of the UHPC with high fluidity and high bonding compensation shrinkage described in examples 1-3 is shown in Table 1.

The results of the performance tests of examples 1-3 are shown in Table 2.

Table 1:

table 2:

as can be seen from the above data, the high flow and high bond compensation shrinkage UHPC described herein has a dry shrinkage of only 30X 10^-6Compared with the UHPC in the prior art, the self-shrinkage and the drying shrinkage rate of the UHPC can reach 800 multiplied by 10 respectively^-6、1000×10^-6The above' obvious reduction is only one-twentieth of the obvious reduction, so that the shrinkage of the UHPC in the early stage, the middle stage and the later stage can be effectively inhibited, the volume of the UHPC is further effectively controlled, the good volume stability is kept, shrinkage cracks are reduced, the bonding force with external structures such as steel plates, sleeves, old concrete and the like is improved, and the volume stability and the reliability of the structure in the construction application of the UHPC are improved. As can be seen from Table 2, the slump of the UHPC described in this application is about 290mm, and the fluidity is very good. By reasonably matching the grain size of the cementing material, the packing state is compact, the water consumption can be reduced, the UHPC cohesiveness is improved, meanwhile, the high fluidity is ensured, and the UHPC strength is improved. By doping the polymer emulsion, the polymer emulsion and the cement slurry form a three-dimensional network whole, so that micro cracks in a particle transition region are reduced, and the toughness of the UHPC is greatly improved. The UHPC has the advantages of good construction property, low shrinkage, ultrahigh strength and high toughnessThe material has the characteristics of good performance, high fatigue resistance, high bonding performance, good durability and the like, and has excellent comprehensive performance and wide application range.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. The high-fluidity high-adhesion compensation shrinkage UHPC is characterized by comprising the following components in parts by weight:

100 parts of Portland cement;

10-20 parts of quartz powder;

10-20 parts of fly ash microbeads;

15-30 parts of silica fume;

5-10 parts of magnesium oxide;

120-150 parts of quartz sand;

20-40 parts of steel fibers;

2-4 parts of a water reducing agent;

0.3-0.5 part of defoaming agent;

5-10 parts of a polymer emulsion;

20-30 parts of water.

2. The high flow and high bond compensating shrink UHPC of claim 1 wherein the portland cement is a 42.5 strength grade or higher portland cement having a Boehringer's surface area of not less than 1000m²Kg, mean particle diameter Dav not greater than 6 μm, median particle diameter D50 not greater than 7 μm.

3. The high flow viscosity high bond compensated shrink UHPC of claim 1 wherein the quartz powder is 800 mesh, SiO₂The content is not less than 99 wt%.

4. The high flow viscosity high viscosity binding compensation shrinkage UHPC according to claim 1 wherein the fly ash micro-beads have a spherical micro-bead content of not less than 90%, a fineness of not less than 1200 mesh and a loss on ignition of less than 2%.

5. The UHPC with high fluidity and high adhesion compensation shrinkage as claimed in claim 5, wherein the silica fume has a Boehringer specific surface area of not less than 20000m²/kg，SiO₂The content is not less than 95 wt%.

6. The high flow viscosity high bond compensating shrinkage UHPC of claim 1 wherein the magnesium oxide has a Boehringer specific surface area of 300-350 m²Per kg, the purity of the magnesium oxide is not less than 95 wt%, wherein the magnesium oxide comprises dead-burned magnesium oxide and light-burned magnesium oxide, and the weight ratio of the dead-burned magnesium oxide to the light-burned magnesium oxide is 3: 7.

7. the high flow viscosity high bond compensated shrink UHPC of claim 1 wherein the silica sand has a fineness of 40-100 mesh, SiO₂The content is not less than 97 wt%, and the bulk density is not less than 1900kg/m³。

8. The high flow viscosity high viscosity compensation shrinkage UHPC according to claim 1, wherein the steel fiber is an end hook type micro steel fiber, the length of the steel fiber is 13 plus or minus 10% mm, the diameter is 0.22 plus or minus 10% mm, the length-diameter ratio is 60, the tensile strength is not less than 2850MPa, and the number of the fiber is not less than 22 ten thousand pieces/kg.

9. The high flow viscosity high bond compensation shrinkage UHPC according to claim 1 wherein the polymer emulsion is a polyacrylate emulsion having a solids content of 40-50 wt%.

10. A process for the preparation of a high flow and high viscosity binder compensated shrink UHPC according to any of claims 1 to 9 comprising the steps of:

uniformly stirring portland cement, quartz powder, fly ash microbeads, silica fume, magnesium oxide, quartz sand, a water reducing agent and a defoaming agent to obtain a first mixture;

sieving steel fibers into the first mixture through a 9.5mm screen mesh, and uniformly stirring to obtain a second mixture;

and (3) uniformly mixing the polymer emulsion with water, and uniformly mixing the polymer emulsion with the second mixture to obtain the UHPC with high fluidity and high bonding compensation shrinkage.